A new dithienobenzo-carbazole (DTBC) heptacyclic arene using sp 2-sp2 dialkylethylene moiety as the bridge was successfully synthesized by Suzuki-Miyaura cross-coupling reaction. This facile benzoannulation planarizes the conjugated framework with the concomitant introduction of four octyl substituents, making the newly designed copolymer PDTBCDTBT exhibit solution processability, superior absorption ability, lower-lying HOMO energy level, and crystalline nature. The solar cell using PDTBCDTBT has produced a high effi ciency of 6.2%, which outperforms the corresponding sp 3 -hybridized C-bridged, Si-bridged and N-bridged analogous polymers.
|頁（從 - 到）||457-465|
|期刊||Advanced Energy Materials|
|出版狀態||已發佈 - 4月 1 2013|
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